I have a ML350 2006 sometimes my ac blows out hot air and takes some time to blow out cold air. Other times it works perfectly. Has any one had this problem before. Please help.

 

You are on the wrong forum. You have a W164 model and it is an entirely different operating system than the W163.

When you get there do a search for Blend Door Motor and you should know what you have to replace.

https://mbworld.org/forums/m-class-w164-72/

 

Thank you

 

Mine was same problem but it was ac clutch
Needed new compressor